How to Reset Terminal license on Windows 2008, 2008 R2 and 2012

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The RD Licensing grace period has expired and the service has not registered with a license server with installed licenses. A RD Licensing server is required for continuous operation. A Remote Desktop Session Host server can operate without a license server for 120 days after initial start up.
The official solution is to Activate the RDS/TS CAL License server and point the Server to License server with User/Device License and will be resolve the problem, but if you want to reset the timer and again avail the 120 days grace time here is the solution:
Solution:

1) First open the registry editor with "regedit" command in command prompt.

 2)open the registry key from below path

 HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM\GracePeriod

3)From GracePeriod delete the key "REG_BINARY".don't delete default registry.

 4)then Restart the computer and check the grace period with "tlsbln" command from command prompt.

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